Keyless lock.



No. 733,387. Patented July I, I902.

A. w. came.

KEYLESS LOCK.

(Application filed Aug. 21 1901.

(No Model.)

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UNirhD- STATES,

PATENT OFFICE.

ALBERT IV. CRAIG, OF CHICAGO, ILLINOIS, ASSIGNOR TO CRAIG KEYLESS LOCK COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

KEYLESS LOCK.

SPECIFICATION ibrming part of Letters Patent No. 703,387, dated July 1, 1902.

V Application filed August 21, 1901. Serial No. 72,811. (No model.)

To rtZZ whom it flirty concern.-

Be it known that I, ALBERT W. CRAIG,a citizen of the United States; residing at Chicago, county of Cook, State of Illinois, have invented a certain new and useful'Improveinent in Keyless Locks; and I declare the following tobe a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being bad to the accompanying drawings, which form a part of this specification.

My invention relates in general to keyless locks, and more particularly to that type of such locks in which the bolt is operated by the engagement therewith of a plate, the latter being provided with a pawl which is adapted to engage registering notches in the tumblers,and thereby operatively connect the plate with a manually-operated spindle.

The object of my invention is to provide a keyless lock of the character mentioned'in which the bolt will have an extended throw.

A further object of my invention is to avoid any liability of the bolt'from being removed from its keeper by pressure exerted thereon by means of an instrument inserted between the door and jamb.

A still further object of my invention is to provide a keyless lock of the type referred to which will be comparatively simple in construction, inexpensivein manufacture, and certain in operation.

Iaccomplish the above objects by providing a plurality of teeth or projections on the plate for throwing the bolt, which'successively engage cooperating recessesin an extension on the bolt, whereby the throw of the bolt is increased, and also by providing a lug or tooth on the bolt extension'which engages a tooth or projection on the actuating-plate when any pressure is exerted on the bolt, thereby preventing the bolt from being removed from its keeper by pressure exerted thereon-as, for instance, by an'instrument inserted between the door and its jainb.

My invent-ion will be more fully described hereinafter with reference to the accompanying drawin'gs,.in which the same isillustrated as embodied in a convenient and practical form, and in which Figure l is an elevational view of my ima lock consisting, essentially, in a bolt having an extension provided with recesses with which engage projections on a rotary camplate,-the latter being actuated through the engagement of a pawl pivoted thereon with notches in a series of tumblers, one of which rigidly engages the spindle upon which is fastened the operating-knob, whereby the ratary cam-plate is operatively connected to the knob or other hand-operated means and through its engagement with the extension on the bolt throws the latter outwardly or withdraws the same from the recess in the jamb.

Referring more particularly to the drawings, reference-letter A indicates a base-plate which supports the various parts of the lock and which is secured to the door in any suit able manneras,for instance, by screws passing through the holes a; The base-plate is provided with a portion A extending at right angles thereto, through an opening in which the bolt B is adapted to reciprocate. The base-plate A is also providedwith a tubular extension A through which the usual spindie for operatingthe lock passes and around which the tumblers are mounted.

The bolt B is provided with an extension B, in which is formed an elongated slot b, through which extends a pin a secured to and projecting from thebase-plateAJ The bolt is provided with a curved: shoulder 11', while recesses andb are formed in the extension 13 of the bolt. Projections b and b are located at either side of a recess 13 and too are preferably formed integrally withfthe bolt extension B.

A cam-plate is rotatably supported around the tubular projection A on the base-plate A and is provided with a curved shoulder 0, adapted to engage with the shoulder b on the bolt 13 when the latter is withdrawn, as shown in Fig. 2. The cam-plate is also provided with an elongated projection 0 conforming in shape to the recess 5 in the bolt extension B. A short and somewhat extended second projection c is also formed on the periphery of the cam-plate (J and is adapted to engage at its opposite sides with the shoulders 79 and b projecting from the bolt extension 13.

A pawl E is pivotally supported on the camplate 0 by the means of a pivotal pin 6. The

'pawl E is provided with a flange E, projecting at right angle thereto, which serves to cooperate with the tumblers. A spring e engages at one end with the flange E and at its other end with a pin 0, rigidly secured to the cam-plate G, the spring 6 being supported upon the pivotal pin 6. The spring 6 tends to hold the pawl E in the position shown in Fig. 3, in which the end 6 thereof engages the pin 0 on the cam-plate.

A segmental guide A is securedto the bedplate A and serves to retain the pawl in engagement with the notches in the tumblers during the oscillation of the cam-plate, pawl, and tumblers to reciprocate the bolt. The guide A terminates slightly below the position which the pawl assumes when the bolt has been shot, thereby permitting the pawl to be swung out of engagement with the notches in the tumblers.

Any desired number of tumblers D may be mounted upon the tubular extension A such tumblers being provided with suitable means for engaging each other and also being provided with notches which are brought into register when the lock is set. Awasher G is secured to the end of the usual operatingspindle by any suitable 1neans-as, for instance, a screw F. One of the tumblers D is provided with teeth, any one of which throws the pawl E out of engagement with the notches in the tumbler in order to disconcert the lock after the bolt has been shot.

The operation of my improved lock is as follows: The tumblers are set through the proper manipulation of the knob and spindle connected thereto in a manner well known in the art. The spring 6 causes the flange E to, engage the registering notches in the tumblers, and thereby locks the cam-plate C to the tumblers, which in turn are locked to the actuating-spindle. The oscillation of the pawl E, which occurs when the flange E engages the notches in the tumblers, removes the end of the pawl from the end of the segmental guide A, thereby permitting the camplate 0 to be rotated with the spindle, and through suitable interlocking means between such cam-plate and the bolt, the latter is withdrawn out of engagement with the recess in the jamb. The withdrawal of the bolt is effected through contact between the projections 0 on the cam-plate and the projection b on the bolt extension B, and subsequently through the engagement of the elongated projection c on the cam-plate with the recess b in the bolt extension B, as clearly shown in Figs. 1 and 2. The bolt B is thrown outwardly from the position shown in Fig. 2 to that indicated in Fig. 1 through the engagement of the projection c with the recess b and is given a further or more extended throw through the engagement of the shoulder 0 on the cam-plate with the shoulder 19 on the bolt extension, the cam-plate 0 being of course locked to the spindle through the interposed tumblers and flange E. The flange E is held in engagement with the notches in the tumbler during the outward throw of the bolt by means of the segmental guide A. When, however, the bolt has beenthrown outwardly to the predetermined limit the pawl E has been swung to a position beyond the segmental guide A, and consequently a tooth on one of the tumblers D may then lift the flange E out of the notches in the tumblers, and thereby disconcert or scatter the look. When the bolt has been thrown outwardly, the shoulder or projection c on the cam-plate passes slightly below the shoulder or projection Z2 on the bolt extension B, as clearly indicated in Figs. 1 and 3. Any pressure exerted on the bolt causes the shoulder 19 to engage the projection c on the cam-plate above the shoulder 0 which looks the camplate and bolt immovably together, and thereby prevents the backward rotation of the cam plate, which would result in the forcible engagement of the flange E with the end of the segmental guide A, which in turn would hold the pawl E in the position shown in From the foregoing description it is evident that I have produced a lock of the keyless type in which the bolt is given an extended throw, thereby rendering the look more secure by reason of the greater depth of engagement between the bolt and the recess in the jamb. It is also evident that in my improved lock any danger of preventing the withdrawal of the bolt, owing to the failure of the pawl to engage the notches in the tumblers when the lock is set, is avoided by reason of the bolt being locked against any retrograde movement through engagement with the cam-plate, such engagement also looking the cam-plate from backward movement, and hence preventing the forcible contact of the pawl with the end of the guide on the baseplate.

While I have described more or less precisely the details of construction, I do not wish to be understood as limiting myself thereto, as I contemplate changes in form, the proportion of parts, and the substitution of equivalents, as circumstances may suggest or render expedient, without departing from the spirit of my invention.

Having now fully described my invention,

a bolt having an extension provided with a plurality of recesses, of a cam-plate having a plurality of projections adapted to successively engage said recesses, a pawl pivotally supported on said cam-plate, tumblers having notches adapted to be brought into register to receive said pawl, and a guide engaging said pawl when the latter is rotated with the cam-plate and disengaged from said pawl when the tumblers are disconcerted, substantially as described.

3. In a lock, the combination with a, bolt, of a rotary plate operatively engaging said bolt, means for rotating said plate and thereby reciprocating said bolt, a projection on said plate, and a cooperating projection on said bolt, the first projection adapted to engage the second to throw the bolt outwardly and the second projection adapted to engage the first to lock the bolt and plate against retrograde movement when pressure is applied to the bolt, substantially as described.

4. In a lock, the combination with a bolt having recesses and projections, of a plate having recesses and projections engaging the recesses in and projections on the bolt, means for actuating said plate and thereby reciprocating said bolt, and means whereby any pressure exerted on the bolt when shot is prevented flOIll being communicated through said plate to said actuating means, substantially as described.

5. In a keyless lock, the combination with a bolt, of a plate engaging and adapted to reciprocate said bolt, a pawl pivotally mounted on said plate having a flange projecting therefrom, tumblers having notches to receive said flange, a guide engaging said flange and retaining the same in the notches in the tumblers when the bolt is actuated, and means for preventing any pressure exerted on the bolt from being transmitted to said flange, substantially as described.

6. In a keyless lock, the combination with a projection adapted to engage the first and lock the bolt and plate against retrograde.

movement when pressure is applied to the bolt, substantially as described.

7. In a keyless lock, the combination with a bolt, of a plate operatively engaging said bolt, a pawl pivoted to said plate, tumblers having notches adapted to be brought intoregister to receive said pawl, a guide retaining said pawl in engagement with the notches in the tumblers to insure the reciprocation of the bolt, said guide terminating at a point to permit the pawl to be swung out of engagement with said notches to disconcert the look when the bolt is shot, and interlocking means between said bolt and plate for locking the bolt in its shot position and thereby preventing any pressure exerted on the bolt from being transmitted to said pawl, substantially as described.

8. In a keyless lock, the combination with a bolt having a deep recess and a shallow recess and a projection between said recesses, of a rotary plate having an elongated projection and an extended low projection adapted to engage with the deep and shallow recesses respectively in said bolt to reciprocate the latter, the projection on said bolt being adapted to engage the low projection on said plate to lock the bolt when shot and prevent any pressure exerted thereon from rotating the plate, a pawl pivoted to said plate, tumblers having notches adapted to be brought into register to receive said pawl, and a guide retaining said pawl in engagement with the notches in the tumblers when the bolt is reciprocated, said guide terminating belowthe position of the pawl when the bolt is shot thereby permitting the pawl to be swung out of engagement with the notches in the tumblers, substantially as described.

In testimony whereof I sign this specification in the presence of two witnesses.

ALBERT W. CRAIG.

WVitnesses:

G-Eo. L. WILKINSON, J. P. WIBORG. 

